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| 槽形管; 半圆明槽排水沟; 梯田台地沟壑; 半圆排水管 | |||
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channel pipe : 9 phrases in 5 subjects |
| Bridge construction | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Rail transport | 1 |
| Shipbuilding | 1 |
| Technology | 5 |
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